How to Choose Rear End Gear Ratios 

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Would love to hear more about torque converter stalls

Great video, great information Thanks man

Whats the best gear ratio for turbo ls truck applications? Would 4.10s or 3.42 gears be better? I hear some say 3.42s are better for loading the turbo?

If you wanted to keep your Car/Truck pretty much stock other than gearing and you had an Ford FE 352 and all you wanted to do was wake it up a little (not for track purposes) what gear ratio would you choose for your vehicle as in not to recommend myself or anyone else, but what would/could YOU choose without having to change the torque converter or whatever else to make the difference improve noticeably? And Thank You for your time and input.

I have a 393 Windsor with 11 to 1 compression and a 600 lift cam The max RPM is 7000 I have 3.08 gears in it now thinking of putting 3.73 or 4.11 maybe 4.10 what would be the best sitting on 15 inch drag radios

So I'm swapping my bmw from auto to manual right now. I'm using the same rear diff for both that has a 2.91 gear ratio. Everyone in the forums is says gonna be a problem on the highway and ill be riding a like 4000rpm when crusin 80(that seems normal tho). Am I going to run into issues.

currently running 4:11 gears in my 67 pontiac lemans with a 389.. rpm is pretty high, so im looking at 3:55 gears to drop down the rpm's.. i would like to do more highway driving than going just around town.. will lowering the gear ratio to 3:55s also help with keeping the engine running cooler also? would like a good cuising speed at about 75mph while keeping the rpms as low as possible, but still have some get up and go...

Man, you have a voice for radio.

I know that there's probably a computer program for this I just don't know it. But how do you think a combination of 4.88 gears, 30 inch tires, a 4L60 transmission, and a gear vendors over/under drive would work for a 4000Lb 4wd vehicle with a built 800+ H.P. 383 stroker built on a 5.3L LS. According to my rough calculation with the grimmjeeper gear calculator it should hit about 200mph at 6000rpm.

Good info thanks

1993 chevy silverado on 6.0L with a th350 what gear ratio do you recommend ????

I have a 71 clone convertible with a 455 and right now it's got 256 they got to go also changing the transmission to a 4 speed I'm. old school and don't know a lot about some of this but it's a retirement project and I want to do everything myself any help I can get would be appreciated

Love your videos man! I have a 67 Firebird convertible with a 2.56 gear and I have a 350 HO with ram air III #16 6x heads and a ram air IV cam. I am still in the break in period in the rebuild and have not gotten on it at all. What I have noticed is that there is literally no power during the lower RPMs. Mind you, I am just turning out into traffic to get up to speed and have not punched it at all. I am looking to install a posi unit and either a 3.55 or 3.73 gear so I can more off the line power. Based on your video, it seems like the 3.73 is going to be a better choice? I am only driving it around town and not on the highways.

Great info

Wait, you guys are talking about racing, launching. No, no race here. I’ve got a ‘69 Chevelle, stock 2bbl 307 and I’m assuming 3.08 gear. At 70-80 mph I’m screaming down the highway and need it to do better. I’m thinking 2.73. Not looking to race anyone, just need the rpm’s to come down. Will it be enough? Can’t afford a 700r4 right now. 😢

I’m currently looking for some help on what would a 3.9 do compared to a 4.1 or 4.3. It’s a LSD for a Miata not sure if it’ll help but right now I’m cruising at 80 mph @4000rpm not sure what ratio I’m running but would love some help!

Not always true..big blocks love higher gears .had a 73 Oldsmobile omega with a mild built Pontiac 455 , peak tq 515 around.2,500 rmp, max rmp 5,000.came with 263? Or 266 can't remember but change to 373 slowed us on mph and time.342 did also not as bad as the 3.73 , 308 mph drop few mph but time all most same as stock .we didn't have 273 to test

I'm just getting into gears . I drive a 2010 jaguar xfr 5.0 Supercharged.....what gear ratio would u recommend??? I'm making about 461 torque..... thanks

Fun ,Thank You ,I like numbers !!!

Hey man. I have a 78 Camaro 350 small block with a th350 and I just put 4.11 in the car. Im debating on dropping down to 3.73 or even Lower. Before the gear switch I had 2.73 and could cruise to 140 mph no problem. The car now can’t even hit 90, the engine is just screaming. Any tips or certain combination I need to get this car running right!?

if you drive a lot on the interstate, pick 373s or 390s. everything else 410s for the street.

Good discussion but… My 4.10 cars all went 2-3 tenths faster in the quarter than the exact same car with 3.73s Granted 99% of the guys out there aren’t looking for max et but I’ve been street racing Pontiacs since the early 80s so all I care about is results 400 with worked 16s or 62s, worked stock intake, worked q-jet, raiv cam 1.6 rockers, recurved distributor,10.5-1 forged pistons, balanced rotating Assy, 4 tube headers with turbo mufflers, Vega converter with long snout in a built turbo 350, 10 bolt with 4.10s 11.30s- 11.50s from spring till fall on 80s street tires with a 150 shot in my back pocket those cars were almost unbeatable on the street in the 80s and 90s It took race cars to beat the car I hauled my kids to school with I’ve street raced since 77 until the 90s if you had a 11.50 car you weren’t afraid to race anyone! The truth is a 11.50 car was super dominant on any street most guys who thought they had fast cars would get bus gapped by a 11.50 car Give me 4.10s for the win😎

Yeah, but what happens after the 1/4 mile.

Mercury grand marquis 2.73 to 3.73 how will it do on highway

You never talk about us 4 speed transmission users

In actual real world testing, I went from 2:73 to a 3:73 gear and dropped .3 tenths on average in the quarter and maybe 1 MPH. 13.7 to 13.4 with no other changes. IDK who in there right mind would think you can drop a second and pick up 5 MPH from a gear change

There is a very intelligent solution available now. Winters Street Rod Performance V8 Quick Change rear end.

Everyone’s different I would’ve thought being here you get better gas mileage and plus when you get out I have 150 160 mile an hour

this makes no sense. much like biden as president

Can you contact me so I can ask you a few questions about my 67? Chevelle rear? End Guerrero with my new 454th street driver. I just had installed in my car thank you so much d j